1 Department of Urology, Urological Science Institute, Yonsei University College of Medicine, Seoul, Korea; Department of Urology, Chuncheon Sacred Hospital, Hallym University College of Medicine, Chuncheon, Korea; Department of Urology, Tanta University Hospital, Tanta, Egypt.
2 Department of Urology, Urological Science Institute, Yonsei University College of Medicine, Seoul, Korea; Department of Urology, Chuncheon Sacred Hospital, Hallym University College of Medicine, Chuncheon, Korea; Department of Urology, Tanta University Hospital, Tanta, Egypt. Electronic address: [email protected].